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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad32aea8bbede661e0e1225373d823374f50f6092ab99621908d13fbe17b755e' 
  AND token = 'fKQarUmyCzHO0U7L9WR6op1Qswf1JMPN2WCtB6dPIE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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