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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9caec1fc986a984d0379216f70af270974178fbad3f1a8d8a79ca3aaf3caed' 
  AND token = 'EI4Rl6J81tMS27EW4hlqxElFdZ3aqaKXyBuvPkc5LFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}