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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf6c87def5bea9186472ad86f8e7261b5494755d0b8d6733a2bdb3da5cb9d60' 
  AND token = 'pHiToDcmvslPLF9l10bOHfRHCzXGO/E4zsUSouCd8GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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