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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e3301f2ad3a52888f17ce2e14898849f21e47a08bfe2e5a04cca46c8ad8c69' 
  AND token = '5Q8DVMbLrGBCgaCyRXTt0LYL0j2flanOjNXfQIldjbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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