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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74d48faa637bd00935e215a034cd19ef1994596c9b0d680b0ffcad1ea229a01' 
  AND token = '5sWr3HJgmAkJLln6TojmDTVS4rrgPfYTeioeAzf39y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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