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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e713925abd322511a517d7b2726091a59a65511a85dc37ec359b5505957da02' 
  AND token = 'UKcbmLgBHAp3aW+G8m4JnY4y3TnFvBBHdZpXTkUjBBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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