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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4c7898dfa491c098d216893cc0e09e48db53b7da47aceacfd51188a03dc9aa' 
  AND token = 'nvVeZnWpT7u3P3TGQmb41MOs8gJkZyvyUkTxLbDo0Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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