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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7e435b6bd8d3b1c835df5bd2766ee0480bd7ec1ffb6732624c19d29b70f011' 
  AND token = 'e3z3AjfcesOyQT3L55IgJuua8GlAEB3odDk4kjq1xng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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