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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f74eace167020a2803e254072a64b05e54840eac5e799d3ac7eafcb537eadf' 
  AND token = 'GDXMEQ4xSwn5KwAOqNod9gFDRxyr0U6MEzSVNw6yxOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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