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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62085ca80e2e9302b5b3e6818fabd6b69ab8524d4f44c096b1db8d5cf84253f' 
  AND token = 'NR5zpjc6VX3JvvE2SneW8DqklKk/ckoZtBQJJBubcY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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