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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0e4797858bc016b99f8d584496bb1eb389bd57163f4654947019f801d7ed3e' 
  AND token = 'PsAtnOs4jtJMSmcLSxXhHR2kN2oMH5k1kq3eqKGGm9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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