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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec98eeb242b1fc2195488c3db7693058f67f5484436c2933a90d2d0e39e7a00c' 
  AND token = 'Eb4mOnt8BoVcc3f/mZgY52VchsMJx/L8RazAL14A/Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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