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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b15d72feddd31fba8e478c71a421754bc00532324a173d4ab0ed58ff234710' 
  AND token = 'XH/RE4ze1LZ0Lz871D7oZ2dNUlScIvElHZheWM6z51I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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