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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbaf6c4e3d30083f314aa7ceae6407b53d010a4c89ac927c262896855d066cc' 
  AND token = 'aS9K7aSqtjKwTSCrABWqsnndO12GiIDMyd8XmmTo/0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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