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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbf30ed2beab2008bd4962674cba3535dd4880100b19b73453193785a4e37f7' 
  AND token = 'AuB9O2oCpON17I6DCZBdeFYTtdgPBP3oFwCy15xk6YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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