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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7987534588381be534342e7a6cdf97752ca9ecc4c5bfa408e7cb60e44141cf0e' 
  AND token = '0hMDvNn1cgPaRL11kSkKCAjhC0X3cHoTYeGuPStuwhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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