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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca94dc04a1e147d16e79005c37cbcb6cd687264217a0dd98d3bca4eae9e672c' 
  AND token = 'hx5NyKZzbZHEkX+Hoz9deKrVWu+OjvqMp3vX2T55t7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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