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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f44536a689cef1746cb60b3b0750ed979b89beab9a4081b8b2399fcbda99ce1' 
  AND token = 'WPbtKqDT4PYFByt4Yte+KTn3EO0G7CEzmlVf/dbFZ58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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