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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8888e24c95cd86b252a4866956b1a5236e8ee81007b7b15a689e694302ff21b2' 
  AND token = 'M30xVuaw2pEFyFkZ/GzbatiLumY/SuIHLgGrYKxLunw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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