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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d51b4b7b2097f384f27a059a3047a7e7419e5a2b081b1cd1dcaa283d4724cab' 
  AND token = 'sc+Js0pclJcR7y8Kx8r6FCALbXifZP68kFPyIn3msXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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