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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b25586339918312c5e0e9535e84a0144000e147e0e87c505290680ba71e00b' 
  AND token = 'KHSUyxP5c03MGzdWYdY4udsYPpEmDCq0btotyP2YftY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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