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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49262a3725b5e628d65e18a5efc7287bfdba0a22d3f9feaedc7502d53b7cf198' 
  AND token = 'mFRnnNyFKypdLuMRld70C4L4auMgU0pv8WvJNg9niqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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