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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fe0c0d636db68a8a2214dd55585406c5f0f81ac1f907872de5b6f5a318ea58' 
  AND token = 'hWAS3CLea6beJJ1tN4bly5EnWvkTn7kDoEBkfaf2lBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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