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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13afa25074322cfd0c317ecce6294ceb566eb3f28ba270df1f59c364f6597d6d' 
  AND token = '3i82+KI1JnIHRwVYRLBKqeeUgNhYIEE2PPqxgiL02QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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