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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4f5c4d0bbfe71f84c8b0d10d3a6093d3c5680d401667bfadbaa3b112c17e5f' 
  AND token = 'd3g10Itbh9eJOVjEiqiLW1RSBkH4tseRun/qH5wzEqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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