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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e386faa579030d3d4f52f5c78856e7a94ec0d543bcf2f41e1871e10b16cc72de' 
  AND token = 'liVy55vGd4nuaKJrJoMD8i0DMxwCk+uQrsAA/35J6wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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