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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfb61cfc6b901ae707c244304cd5959ca72e59a17de77ed0c484ea5587575a6' 
  AND token = 'KGbaYdb+KmnVKdgXhtXw4jDvaaAbm9EqQWDbxm2O57s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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