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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda9787aa10efe4ce3193ef1c4d89c245a8df7377d93c266788d863bb4b0f6ce' 
  AND token = '5VrKjituzEIPFTy2AaW33Ot36RKTyShw9MTdXC7g6uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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