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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7662290895bf6619a21fcf959b95536027943128d67057ff9a62ca698e7bf6dc' 
  AND token = 'VaAYf+pxiRiwLB8NICWXyKxX2n6Qx4l2ew3ee0TY5w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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