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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be34c169da8b4d25db4b7cc8a6d92fcfbbae74ec1d19b8ee5251321d503c4054' 
  AND token = 'xaN8W/NK6nNVaBBLJgTwWL3ugzONgx1HcLhznRe7H6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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