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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d3990a1bdeb89ace1c6c418d5f6d4c3244e23670e7401c25ca2c9986ecd793' 
  AND token = 'P+C8xeSwJBnoQ3/sPzZK8ICF8O9sitU/bDkAwM2kWUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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