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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d112cc4ab0150b6e62640d8b9605710570cd33ba522ee40b2b07bef214982f' 
  AND token = 'r9b/b1BjATYP36c/pNslrO5wnLTO8Bc20GqtRn3chxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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