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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c06d0a45366b25618b3026e2575eac58eb14570c5d96278e17c54d9b16b0de' 
  AND token = 'jc5x7McxAHitHNV9T8RA6/GwLgkzfcul/jqU4DTfomc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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