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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b695a63c9a2b7aa1dae84222db0e8226fcb0abd36c6ad68983548fa392215eed' 
  AND token = 'Vnqg/ETnWjBD0XS6AcdQ96yrh8kinIX5I7dwENXoc/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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