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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0a438733ac9012cf39a554fc59a3ed993165a59514168f3c7a3c292c0fd90e' 
  AND token = 'MnfaIrTnF5CSCuaR/O6gUYmu936osmZlwtmA3FQRAzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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