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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfe76cffe1a2b9292b3ccec40b18368286e73d0143ce6cbb68d5000a98c6726' 
  AND token = 'JkxErsZdt4XmIWHMa0GHmzGTEeaydUWjQ8EKQjpUaHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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