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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6003ee6a87e2b9ad09a8aea39034e16f98a05234e23a526d0ea0e48b2a62c460' 
  AND token = 'nDxQ38ufyA8tENP2ZIrChGAnG+I271vdMxvTsbSdPSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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