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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550bd31b979d5481732d6a01b03bdffe73751b963cc4c4dc133ea18a26d4c606' 
  AND token = 'Y3exYNM5ObvHb1s780NR264k7OO/0O2VBUDW56N6feg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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