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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beae09a464ae5c1d4a8c3e51d40fa55f8338c2367207baa9e3c9fad02de29e0e' 
  AND token = 'uDsQR1M/o4wBuBrDjxK2xzKokg4sxswuAm1HJySQHTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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