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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5de51365006448c7018d222a03b0ceeb76f9dfd58c75111785513f22ff668e' 
  AND token = 'rnFTletDwOoGwEAl4Ackv/kqvB4d97CGSaqNXKfu/go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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