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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d063b07354a2547657d91e09139ee7ff6372a1a4be5e363db65f64ddd2d1ce9' 
  AND token = 'BiuHe8KwGNVnZ9wLLilSOPlMhhDKewBQeWnFIZlm72E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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