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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0769c4eb136dc92e92cc7a600d33bd3f4e51166565c66bca3e2b6407134c2837' 
  AND token = 'QqzQt9wGZQrnZ9dUbViO/DEsjYOc257wBO2tDdLdyA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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