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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e96015e8b8b18750bb566af6b6170d5a7e98d1ce8504409d261ebda695de482' 
  AND token = '/lHIQvwLCMT1RHqDKS/HeEwoXp0KL1lCbK4cr47V4AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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