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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbaeb2b395f83aba274e3b7cb3d5d7d42ae28ac4684c50ec53f00e168f7fb870' 
  AND token = 'r7lgtNeIGXVW6jSjtyGmoTJodXDyFmSGPX4CuSqyozo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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