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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a4412b9533be4181c8c90c76c1e0b78765dac6c94c980e5ef5428606314217' 
  AND token = '/SMQSYxW+tT1LvzeXFlVFU5FIF4sH5dpJ+Ulx5wgNZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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