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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03a4939fd3db2f14476590343a9fa1d384ec73d1dcc49f87389e3c7ae417d22' 
  AND token = '6K6saJoBNOzArJZW5xlmaYaZloFfkDBRObCJnxiP0Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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