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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4306c643a2c556c49d790b906fb097da91e2fa170bbdf2c942c481a81da447' 
  AND token = 'RhulxmD2Wu8BwfDti6c3WpY7L6xlr5kSffXujbI8hn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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