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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103602a90185cba098fbb8f842609ffdd4c775810a2cc1983dec4137d2a64275' 
  AND token = 'EiycRCt1hAHS5l7e1rUE7oR9HL5AmknaX8FCZS/LDNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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