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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8364662e00ddc3cb17039f0a87b7ad60e16da35c3de84a1b7bdde68b4edf1836' 
  AND token = '13FNNUZBPovZJMNSjpgSe3/yvCykroNBdueLVWUroyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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