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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541b6423fc85c494bd7e4d1003ba58793b7d88a6bf64ca63e8801739845268a4' 
  AND token = 'DqyxqQhE11p27wfNkx79qJfQErS6ghG96Q2TVRDMf6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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