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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7638af1aa87824af7a2173fecc4a138f72dfb8ad5d1f74aa14ea9b0226df8c' 
  AND token = 'bd+8xyyE9eBGUBy7N3svfkh4AahwjgZ7oTjEkRNcs5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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