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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d827dd92c6a1a4e6ee89d4f47e37543d24b4dd67a9a8328f26db12c0fda4e0' 
  AND token = 'brgx/hHkhVXOWxXoye67uPLpNxr8oyo1T5cEO7Q26C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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