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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad66839a363136405671b1363e2d88b58fc9f66b609e9103bb75596e7cb34e9d' 
  AND token = 'jIX0DKnOqltDf5uIb6t5NSPYweAkCpijP7FIXwBogoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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