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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd074de9f8e8bd35e52c6d755f2c02ebae0e06da4d955438ac8f4cdd32ebaad4c' 
  AND token = 'tSDip6nneHRI2cFVNegHuY1CnwLLxNsRc84iN0FODgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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