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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe4d2564036157dd98b503b6507cffbdd922d904920c4987ac2645a24887cde' 
  AND token = 'yYOzF+nHhPAemkBL9MaxEafev7PT1Q8F9oyKQX5w5s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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