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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef06a98f4d0c0f93884ef5ba13efc5b4a660334adeea50a57291e356b5bd0b00' 
  AND token = '6D55Ht4wHKfzCGAvKBHAN7Zw4z+HiOmVB6WVFxJ+0Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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