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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe661f3305d0a0af86ef0db5625b89d43ff642f866cc2b206b2beadfb0740d2' 
  AND token = 'g6OKxP/zBEpqMhOtgmg9sF5CJuZBI6jrB83oZm11zg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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