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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8fabd8e3af0bbc67f64cb97f2d8be2f6a867f5cbdfcdb962250c3b941a92f6' 
  AND token = 'GS77n33M/GumHokOszrrqZFR2jM4ni4oxgGnQj0s7x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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