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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf60f67a1e4404bce2dfa1dd17678de1b7313e7f16aabf0d62a4207dc9c7052d' 
  AND token = '3TozLVj19L2eQtZ8JtLvgTt+NmwoE8xhNGVJOGZXh2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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