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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b05a62351836e538e45bfaf58e3ecb5a40cec9e6c847ed4d216ef551fec0e0d' 
  AND token = 'JC708d5eImaUhuLCx1Byu9PHn/0wfAhFkDDYVgrxuP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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