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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e34e48f31536355df86b6e10d27e73d8aedaea7f27dda026ae11220f7a3d52' 
  AND token = 'PFu4LRMGa4/S6rTRqskcdkzX+tJUoPR04gdWR6H8hrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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