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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7781995398f07cbc176f5d58a171ac57033a15fc6748a05ec42968490f98feb' 
  AND token = '41Cv3l3CBZcYLXv9iytoM8OmuDIoMBXhKqwbTnp7/nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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