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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3bb06eb11e60721b815b3e000608dfc41764223f960407cf29f4ced5fb4a29' 
  AND token = 'QwrutBJKWvBCuY5iCKN6/+amQrzU0w5d0Tk1kl+BSb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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