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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bf1e29a28e6d793e89c933a28d44d4d8d29f922909ab519f9d4762b5d1faa9' 
  AND token = 'ebtdRFamzI3uEyi3YRmJtDuC2gq1eV1NoXIoSvYHEXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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